6824( 11) - 03/31/97 10:29 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6824 Version: 11 Check-in Date: 31-Mar-1997 10:27:16 1.Proposal Title: PC Imaging of HH29: The Nearest Interstellar Shock ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle BINARIES AND STAR FOR GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: DAVID DEVINE UNIVERSITY OF COLORADO CoI: John Bally University of Colorado N CoI: John Stocke University of Colorado N CoI: Jon Morse University of Colorado N ------------------------------------------------------------------------------------ 6. Abstract High resolution imaging of HH objects associated with stellar jets allows us to investigate the interaction zone where the jet impacts the surrounding medium, the resulting shock structures that are formed, and the temporal behavior of the jet itself. We propose narrow band H Alpha \ and SII PC imaging of HH29, which is associated with the well studied L1551-IRS5 flow located at a distance of approximately 150 pc. HH29 is one of the closest HH objects that is bright enough for study with the PC, allowing us to investigate shock structures associated with the outflow from a forming star at the unprecedented scale of 7.5 AU. This will impact our understanding of interstellar jets, shocks, and jet driven outflow models. ------------------------------------------------------------------------------------ 6824( 11) - 03/31/97 10:29 - [ 2] Observations Description ------------------------ We propose narrow band PC imaging in the emission lines H Alpha \\ (F656N) and SII (F673N) We estimate that four orbits will be needed for H Alpha \\ and SII. The exposure times were estimated in two methods, published fluxes and angular sizes of HH29 and the method outlined in the WFPC2 manual for extended emission line objects, and direct scaling from ground based NTT images taken under excellent seeing conditions. H Alpha \\ and SII fluxes were determined by narrow band imaging of HH29 and the bright knot HH29a under excellent seeing conditions by Fridlund et al (1993) along with angular sizes of the emitting regions. This allows for a direct determination of exposure times using the methods outlined in the WFPC2 instrument handbook for extended emission line sources. Readout noise, dark current and expected sky background were determined also via the methods in the handbook. The resulting count rates for the brightest region (HH29a) are .06 electrons per second for H Alpha \\ and .02 electrons per second for SII. An exposure time of 10^4 seconds results in S/N(H Alpha \\ ) ~24 and S/N(SII)~ 13.4. From the ratio of the fluxes and sizes for HH29 and HH29a, this corresponds to S/N(H Alpha \\ )~5.4 and S/N(SII)~3.0 for HH29. As a consistency check we also estimated exposure times by scaling from HH47 WF images obtained in cycle 5 and the corresponding determined fluxes. The expected exposure times agreed well with the calculated estimates. We expect that the observed S/N ratios should be a bit higher, as the ground based observations are not able to resolve angular scales <=sssim .5" \\ . We require orbit long integrations with no CR splitting to ensure that the read noise will not dominate the signal. We will use two pairs of exposures offset by .25 x .25 arcseconds for each filter. This should allow for cosmic ray removal as well as deconvolution techniques to maximize the resolution. Real Time Justification ----------------------- Because of the high proper-motions of the objects it is essential that once the observations of a given object have commenced then they are completed (in both filters) within a 2 week period. The orientation range 72D to 74D will maximize the science obtained with the WF cameras, if this creates a fatal scheduling conflict then the range 80D to 100D may be used, but at a cost to the science. Wide field, narrow band images of L1551 were obtained at Cerro Tololo InterAmerican Observatory in December of 1994, and at Kitt Peak National Observatory in October, 1995. The high angular resolution images representing the limits of ground based imaging were taken in 1990 with the ESO New Technology Telescope. Optical spectra of HH29 were obtained in early January, 1996 at the KPNO 4m. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6824( 11) - 03/31/97 10:29 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: ------------------------------------------------------------------------------------ 6824( 11) - 03/31/97 10:29 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HH29 ISM,Herbig-Haro Object RA= 4H 31M 27.46S +/- 0.04S, 2000 V = -40 SURF-LINE(6562)=8.8+/-.1e-16 DEC=+18D 6' 24.4" +/- 0.5" W-LINE(6563)=3.8+/-0.1 SURF-LINE(6731)=6.0+/-.1e-16 W-LINE(6731)=3.8+/-0.1 Comments: THE SUFACE BRIGHTNESS REFERS TO THE ENTIRE HH29 KNOT WHICH IS ROUGHLY 12 X 18 ARCSEC SQUARE. ABOUT 20% OF THE FLUX IS CONCENTRATED INTO A SMALLER KNOT THAT IS APPROXIMATELY 2 X 2 ARCSEC SQUARE. THE SURFACE BRIGHTNESS FOR THE [SII] LINE (6731) IS THE SUM OF THE (6717,6731) DOUBLET LINES. 6824( 11) - 03/31/97 10:29 - [ 5] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: THE ORIENTATION RANGE 72D TO 74D MAXIMIZES THE SCIENCE. IF THIS RANGE IS FATALLY RESTRICTIVE, THEN AN ORIENTATION OF 80D TO 100D IS POSSIBLE, BUT AT A LOSS OF SCIENCE. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 101 HH29 WFPC2 IMAGE PC1-FIX F656N CR-SPLIT=NO 1 2500 S EXPAND MAXimum DURation 4000S MINimum DURation 2500S Comments: NO CR SPLITTING TO ENSURE THAT THE READ NOISE WILL NOT DOMINATE. 101,102,107 AND 108 HAVE THE SAME POINTING. ------------------------------------------------------------------------------------------------------------------------------------ 102 HH29 WFPC2 IMAGE PC1-FIX F656N CR-SPLIT=NO 1 2700 S SAME POSition AS 101 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101 ------------------------------------------------------------------------------------------------------------------------------------ 103 HH29 WFPC2 IMAGE PC1-FIX F656N CR-SPLIT=NO 1 2700 S POSition TARGet 0.25,0.25 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101. 103-106 HAVE THE SAME POINTING, OFFSET FROM 101 BY .25 X .25 ARCSEC FOR DECONVOLUTION ------------------------------------------------------------------------------------------------------------------------------------ 104 HH29 WFPC2 IMAGE PC1-FIX F656N CR-SPLIT=NO 1 2700 S SAME POSition AS 103 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101,103 ------------------------------------------------------------------------------------------------------------------------------------ 105 HH29 WFPC2 IMAGE PC1-FIX F673N CR-SPLIT=NO 1 2700 S SAME POSition AS 103 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101,103 ------------------------------------------------------------------------------------------------------------------------------------ 106 HH29 WFPC2 IMAGE PC1-FIX F673N CR-SPLIT=NO 1 2700 S SAME POSition AS 103 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101,103 ------------------------------------------------------------------------------------------------------------------------------------ 107 HH29 WFPC2 IMAGE PC1-FIX F673N CR-SPLIT=NO 1 2700 S SAME POSition AS 101 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101 ------------------------------------------------------------------------------------------------------------------------------------ 6824( 11) - 03/31/97 10:29 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 108 HH29 WFPC2 IMAGE PC1-FIX F673N CR-SPLIT=NO 1 2700 S SAME POSition AS 101 EXPAND MAXimum DURation 4000S MINimum DURation 2600S Comments: SEE COMMENTS FOR 101 ------------------------------------------------------------------------------------------------------------------------------------ 6824( 11) - 03/31/97 10:29 - [ 7] Summary Form for Proposal 6824 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category BINARIES AND STAR FORMATION ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements EXPAND MAXimum DURation 4000S MINimum DURation 2500S SAME POSition AS 101 EXPAND MAXimum DURation 4000S MINimum DURation 2600S POSition TARGet 0.25,0.25 EXPAND MAXimum DURation 4000S MINimum DURation 2600S SAME POSition AS 103 EXPAND MAXimum DURation 4000S MINimum DURation 2600S ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F656N F673N ------------------------------------------------------------------------------------------------------------------------------------ Target Names HH29 ------------------------------------------------------------------------------------------------------------------------------------